tests: add no-args help test

Author: evenstensberg

package-lock.json

@@ -117,6 +117,7 @@
     "ansi-escapes": "^4.2.0",
     "cli-table": "^0.3.1",
     "command-line-args": "^5.1.1",
+    "command-line-usage": "^6.0.2",
     "import-local": "^3.0.1",
     "terser-webpack-plugin": "^1.3.0",
     "update-notifier": "^3.0.1",
@@ -145,6 +146,7 @@
     "jest": "^24.8.0",
     "jest-cli": "^24.8.0",
     "jest-junit": "^6.4.0",
+    "jest-serializer-ansi": "^1.0.3",
     "lerna": "^3.15.0",
     "lint-staged": "^9.2.0",
     "nyc": "^14.1.1",

package.json

@@ -0,0 +1,51 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`help-no-args 1`] = `
+"
+          ⬡                     webpack                     ⬡
+
+		         https://webpack.js.org
+
+		The build tool for modern web applications
+
+		Usage: \`webpack [...options] | <command>\`
+
+		Example: \`webpack help --flag | <command>\`
+
+
+
+Available Commands
+
+  create    Initialize a new webpack configuration                 
+  migrate   Migrate a configuration to a new version               
+  loader    Scaffold a loader repository                           
+  plugin    Scaffold a plugin repository                           
+  info      Outputs information about your system and dependencies 
+
+Options
+
+  --entry string            The entry point of your application                 
+  -c, --config string       Provide path to a webpack configuration file        
+  -r, --register string[]   Preload one or more modules before loading the      
+                            webpack configuration                               
+  -m, --merge string        Merge a configuration file                          
+  --progress string         Print compilation progress during build             
+  --color                   Enables/Disables colors on the console              
+  --help                    Outputs list of supported flags                     
+  -o, --output string       Output location of the file generated by webpack    
+  -g, --global string[]     Declares and exposes a global variable              
+  -t, --target string       Sets the build target                               
+  -w, --watch               Watch for files changes                             
+  -h, --hot                 Enables Hot Module Replacement                      
+  --debug                   Switch loaders to debug mode                        
+  -s, --sourcemap string    Determine source maps to use                        
+  --prefetch string[]       Prefetch this request                               
+  -j, --json                Prints result as JSON                               
+  -d, --dev                 Run development build                               
+  -p, --prod                Run production build                                
+  --version                 Get current version                                 
+
+
+                  Made with ♥️  by the webpack team 
+"
+`;

test/binCases/help/no-args/__snapshots__/help-no-args.test.js.snap

@@ -0,0 +1,11 @@
+'use strict';
+
+const { run } = require('../../../testUtils');
+const serializer = require('jest-serializer-ansi');
+
+test('help-no-args', () => {
+    const { stdout, stderr } = run(__dirname, ['--help']);
+    expect.addSnapshotSerializer(serializer);
+    expect(stdout).toMatchSnapshot();
+    expect(stderr).toHaveLength(0);
+});